I think it would be b in my
use of commercially produced fertilizers
Note: industrial revolution to agriculture
Hope this helps
Human geography or anthropogeography is the branch of geography that deals with humans and their communities, cultures, economies, and interactions with the environment by studying their relations with and across locations.[1] It analyzes patterns of human social interaction, their interactions with the environment, and their spatial interdependencies by application of qualitative and quantitative research methods.
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number of different pairs the teacher can choose= nCr (18+14, 2)=496
no. of opposite gender pairs possible= 14 (since there are only 14 boys)
probability = 14/496= 7/248
